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无卤阻燃增韧增强PA66的研究进展 总被引:1,自引:0,他引:1
尼龙66作为重要的工程塑料,在汽车和电子等行业有着广泛的应用,开发无卤阻燃增强增韧技术是目前尼龙66改性领域的一个新热点。文章综述了近年来尼龙66改性及无卤阻燃的研究与进展,为研究无卤阻燃增强增韧的尼龙66提供一定的理论指导。 相似文献
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研究了改性三元乙丙橡胶增韧尼龙66时橡胶含量对冲击韧性的影响。用WAXD研究了增韧前后尼龙66的结构变化,计算了结晶度和微晶尺寸,结果表明超韧后尼龙66的结晶性下降。同时测定了冲击断口应力发白区的结构变化,说明在断裂过程中,由于基体屈服,韧性尼龙66晶型发生了转变(部分α型转化为准六方晶型) 相似文献
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纳米硫酸钡增强增韧尼龙66 总被引:1,自引:0,他引:1
通过熔融共混法制备了纳米硫酸钡增强增韧尼龙66复合材料。研究了纳米硫酸钡含量对增强增韧尼龙66复合材料力学性能的影响。结果表明,纳米硫酸钡对尼龙66有显著的增强增韧作用。尼龙66的韧性、刚性和强度随着纳米硫酸钡含量的增加先增后减,在纳米硫酸钡质量分数为3%时,力学性能最优;对比空白样,缺口冲击强度提高了17.1%,弯曲强度和模量分别提高了5.74%和11.57%,拉伸强度和模量稍有提高。 相似文献
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探讨了国内外尼龙材料增韧研究的现状,目前尼龙材料增韧主要集中于以下几个方面:用尼龙与弹性体共混制备超韧尼龙,包括聚烯烃类弹性体增韧尼龙,苯乙烯类嵌段共聚物增韧尼龙,核-壳型冲击改性剂增韧尼龙,以及离聚物为增容剂增韧尼龙;无机刚性粒子增韧尼龙,能在提高材料的抗冲击性能的同时,保证不降低其拉伸强度和刚性;有机刚性粒子增韧尼龙。 相似文献
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李跃文 《玻璃钢/复合材料》2017,(3)
阐述了玻璃纤维增强尼龙66在增韧改性、阻燃改性、耐溶剂改性、耐磨改性、界面改性、复合改性和制备工艺改进等方面的研究进展。指出玻璃纤维增强尼龙66目前常用的增韧方法是与弹性体和高韧性聚烯烃共混,而阻燃改性的有效手段是添加微胶囊化红磷和P-N型阻燃剂。 相似文献
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高抗冲玻纤增强尼龙-66的研制 总被引:4,自引:1,他引:4
研究了尼龙 66/玻璃纤维/增韧剂共混材料的力学性能。结果表明随玻纤含量的增加,材料的拉伸强度、弯曲强度有大幅度的提高,冲击强度则较为复杂,增韧剂加入,材料的韧性大幅度的提高。添加 3 0 %~ 3 5 %的玻纤,8%~ 12 %的增韧剂,材料的综合力学性能最佳。 相似文献
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采用玻璃纤维(GF)、反应性增韧母料(RTMB)与PA66热机械反应性共混制备出了PA66/RTMB/GF复合材料.用IR、SEM、力学性能测定等方法研究了PA66/RTMB/GF复合材料的化学结构、断面形态及力学性能.结果表明:PA66/RTMB/GF中RTMB、GF和PA66间形成了化学键连接,GF和PA66间呈柔性界面结合;PA66/RTMB/GF质量比为60/10/30的复合材料的拉伸屈服应力、弯曲弹性模量、悬臂梁缺口冲击强度分别提高到原料PA66的1.73倍、2.72倍、3.86倍. 相似文献
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Melamine cyanurate (MCA) was utilized as an environmental friendly additive to prepare the nonhalogen flame retardant MCA/Nylon 66 composites by melt blending technique. Because of the strong hydrogen bond interactions and fine interfacial compatibility between MCA and Nylon 66, the resultant even dispersion of MCA filler in polymer matrix leads to the better toughness and strength of MCA/Nylon 66 composites than those of neat Nylon 66. Both Nylon 66 and MCA/Nylon 66 composites exhibit similar α‐crystalline structure, but the presence of MCA influences the distribution of α1 and α2 crystalline phases in Nylon 66 by inducing its hydrogen‐bonded sheet separation. Moreover, the blending of MCA and Nylon 66 increases the crystallization temperature and exothermicity but decreases the thermal stability of Nylon 66 and accelerates the degradation of MCA. The MCA/Nylon 66 composites show better flame retardancy at intermediate MCA contents of 10 and 15 wt %. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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本文介绍了汽车变速箱同步环精锻件的发展历程。同步环原来采用铜合金制造,但是由于钢质同步环比铜质同步环的成本低、强度和硬度高,使用性能好,寿命长,即使目前在精锻时某些部位成形碰到这样或那样的困难。然而最终取代铜质同步环是必然趋势。 相似文献
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新型尼龙46工程塑料的性能及应用 总被引:1,自引:0,他引:1
综述了新型尼龙46工程塑料的合成及发展过程,从微观结构上分析了尼龙46和尼龙6、尼龙66等其它工程塑料熔点、结晶度、玻璃化转变温度以及结晶速率的差异,进而讨论了尼龙46和其它工程塑料性能上的差别,并简述了46的应用领域、加工注意事项以及今后的研究、开发方向。 相似文献
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Multi-walled carbon nanotubes (MWNTs) were modified with poly(hexamethylene adipamide) (also known as Nylon 66) via a controlled polymer solution crystallization method. A “nanohybrid shish kebab” (NHSK) structure was found wherein the MWNT resembled the shish while Nylon 66 lamellar crystals formed the kebabs. These Nylon 66-functionalized MWNTs were used as precursors to prepare polymer/MWNT nanocomposites. Excellent dispersion was revealed by optical and electron microscopies. Nitric acid etching of the nanocomposites showed that MWNT formed a robust network in Nylon 66. Non-isothermal DSC results showed multiple melting peaks, which can be attributed to lamellar thickness changes upon heating. The crystallite sizes L100 and L010 of Nylon 66, determined by WAXD, decreased with increasing MWNT contents. Isothermal DSC results showed that crystallization kinetics increased first and then decreased with increasing MWNT contents in Nylon 66. This study showed that the effect of MWNTs on Nylon 66 crystallization is twofold: MWNTs provide heterogeneous nucleation sites for Nylon 66 crystallization while the tube network structure hinders large crystal growth. 相似文献
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Knowledge of the nature of molecular processes occurring during melt compounding of nanomaterials and polymers is crucial in determining the ultimate performance of polymer nanocomposites. In this paper, we demonstrate for the first time with detailed transmission electron microscopy, the parameters that affect the microstructure of polymer nanocomposites by varying the blending sequence. Nylon 66/organoclay/SEBS-g-MA ternary nanocomposites prepared by four different blending sequences exhibited distinct microstructure and mechanical properties. It was concluded that the best microstructure for toughness and other mechanical properties is to have the maximum percentage of the exfoliated organoclay in the nylon 66 matrix rather than to have it in the dispersed SEBS-g-MA phase. The presence of organoclay in the SEBS-g-MA phase reduces the latter's ability to cavitate, resulting in reduced toughening efficiency. 相似文献